Home Forums Hunting & Shooting Ask The Gunwriters When will a Hornady 180gr IL cease to expand?

This Nosler would work O.k. for what your after....



150 grain

Joule: It is the energy expended in applying a force of one newton through a distance of one meter. Or: The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt (C�V). Or ; The work required to produce one watt of power for one second; or one watt second (W�s).

http://www.engineeringtoolbox.com/heat-units-d_664.html

The most common units for heat are

�BTU (Btu) - British Thermal Unit
�Calorie
�JouleBTU - British Thermal Unit
The unit of heat in the imperial system - the BTU - is

�the amount of heat required to raise the temperature of one pound of water through 1oF (58.5oF - 59.5oF) at sea level (30 inches of mercury).
�1 Btu (British thermal unit) = 1055.06 J = 107.6 kpm = 2.931 10-4 kWh = 0.252 kcal = 778.16 ft.lbf = 1.0551010 ergs = 252 cal = 0.293 watt-hours
An item using one kilowatt-hour of electricity generates 3412 Btu.

Calorie
A calorie is commonly defined as

�the amount of heat required to raise the temperature of one gram of water 1oC
�the kilogram calorie, large calorie, food calorie, Calorie (capital C) or just calorie (lowercase c) is the amount of energy required to raise the temperature of one kilogram of water by one degree Celsius
�1 kcal = 4186.8 J = 426.9 kp.m = 1.163 10-3 kWh = 3.088 ft.lbf = 3.9683 Btu = 1000 cal
Be aware that alternative definitions exists - in short:

�Thermochemical calorie
�4 �C calorie
�15 �C calorie
�20 �C calorie
�Mean calorie
�International Steam Table calorie (1929)
�International Steam Table calorie (1956)
�IUNS calorie (Committee on Nomenclature of the International Union of Nutritional Sciences)
The calorie is outdated and commonly replaced by the SI-unit Joule.

Joule
The unit of heat in the SI-system the Joule is

�a unit of energy equal to the work done when a force of one newton acts through a distance of one meter
�4.184 joule of heat energy (or one calorie) is required to raise the temperature of a unit weight (1 g) of water from 0oC to 1oC, or from 32oF to 33.8oF
�1 J (Joule) = 0.1020 kpm = 2.778 10-7 kWh = 2.389 10-4 kcal = 0.7376 ft.lbf = 1 kg.m2/s2 = 1 watt second = 1 Nm = 1 ft.lb = 9.478 10-4 Btu

One of the things the professor in my graduate level thermodynamics class emphasized (and the textbook emphasized) was the equivalence of energy in heat and mechanical displacement. Energy is energy - some specific units of measure are more common for one type of energy than another (e.g., mechanical vs. heat vs. electrical), but energy is energy, and you can equate a British thermal unit (Btu) to a quantity of energy in the units of hp-hr or ft-lbf or Joule or calorie. We're accustomed to seeing heat energy measured in Btus or calories, but those units can also be used for mechanical energy - it just seems odd because a Btu is not customarily used as the unit of measure for mechanical energy.

Thanks Rambling, JWP does not seem to get that concept.

Per Isaac Newton

(Not Exact Law) Energy is never lost but can be transferred; heat, electricity, kinetic, etc. Joule is THE unit of energy regardless of form.

Right on Ramblin

"Shoot a 150 or 165 grain Nosler ballistic tip and they will open up at near 1,000 fps and do MORE damage than you will ever hope for with a 180 of any brand at low velocity."

Is this really true? Nosler says the optimum performance range for the BT is 1800 to 3100 fps. See link:
http://www.nosler.com/Bullets/Ballistic-Tip.aspx

Thanks for your answers!

The question stems from the fact of me trying to reduce noise levels while still maintaing the legal requirements of the load. I need to stay over 2000 JOULE at 100m with a bullet weighing more than 10 gram (154 grans). A soft, streamlined 180 grain bullet would be perfect as any velocity gained from a high BC is valuble! As I've good results from the Hornady 150 gr SST I might try the 180 grain version - good idea! For now I have a box of the common Interlokt on the bench and will try them out a bit more. So far the accuracy has been good enough, > 0.8 MOA at 90m and the noise seems more fitting for a .22 LR.

Having a low velocity and low muzzle preasure seems to be a good way of getting a moderator (silencer) to keep the report at a low level.

I might have to clarify that I don't expect a higher BC to help in making the trajectory flatter - at the ranges this load is to be used (<150m) trajectory is sort of a non issue but velocity is not.

//K9_75

Try the 178 Amax. It might expand a little slower.

Bb